Re: "Knave" in OED

: : : : : Can anyone help me with the meaning / origin the phrase
*hit the jackpot*

: : : : : thanks in advance.

: : : : You "hit the jackpot" when you suddenly get a lot of money.
Jackpot, according to the dictionary:
: : : : Main Entry: jack·pot
: : : : Pronunciation: 'jak-"pät
: : : : Function: noun
: : : : Date: 1881
: : : : 1 a : a hand or game of draw poker in which a pair of
jacks or better is required to open : a large pot (as in poker)
formed by the accumulation of stakes from previous play b :
a combination on a slot machine that wins a top prize or all the
coins available for paying out : the sum so won c : a large
fund of money or other reward formed by the accumulation of unwon
prizes
: : : : 2 : an impressive often unexpected success or reward

: : : : My question to our UK posters: in the US, jacks in a deck
of cards have never been called knaves (except perhaps in the nursery
rhyme where the knave of hearts stole some tarts) ... in the UK,
are knaves still knaves? Has "jacks" taken over? Is this something
changing over time?

: : : They are overwhelmingly 'Jacks' - 'Knaves' is used in much
the same way as in the US.

I've played cards a lot in England and never heard anyone use the
word knave. On the other hand it must have been the (or a) middle-class
usage in the mid-19th century: in "Great Expectations", working-class
Pip is taunted by being told (from memory) "He's an ignorant little
boy: he calls the knaves jacks"